Apply the jetseal to the whole car using a Microfibre applicator or cloth (if you've got a da then either a finishing or glaze pad - this will give you a more even coverage to).
Leave on the car for 20 minutes and then buff off, leave 20 minutes and the do another coat - it doesn't have a curing time/gas like a wax so you can apply several layers in a row with no problem.
Another good qd although a little more expensive than chemical guys pro detailer (p40 was a typo by David on the label!) is chemical guys hybrid v7 it is a sealant qd and gives you even better protection it helps with maintenance washes and also will remove any water marks from black which can be a pita on this colour. I used this on my black s3 after it had been given a full detail...I you have time check out the detailing gallery on the site (below)
Chemical Guys Jetseal109 | Sealants | Juicy Detailing
Chemical Guys Hybrid V7 High Gloss Spray Sealant 16oz | Sealants | Juicy Detailing